Tony, I think you know my views on this, but in any event there's a longish post on my blog here that you may find worth a read (there are some photos too, obviously). With regard to old v new, the size is more related to your own wrist size than anything else; I'd say that a 7" or under wrist puts the old model firmly in pole position, though. I also far prefer the baton markers to the Roman numerals on the newer model but that's purely personal preference. I just find the dial cleaner.
As for the functional aspects, I've yet to see a cleaner and more elegant solution to the PC complication - you'd barely know it was a PC, in fact. I also like that day, month, year and moonphase can all be both independently set or set in unison as you would with a locked mechanism. Basically, the watch is perfect in every way. I've had mine for well over a year now, and whilst I wear it sparingly I can't imagine ever selling it unless forced to do so.